﻿86 
  

  

  DECIDUOUS 
  FRUIT 
  INSECTS 
  AND 
  INSECTICIDES. 
  

  

  Table 
  IV. 
  — 
  Tests 
  of 
  the 
  hilling 
  effect 
  on 
  the 
  fall 
  webworm 
  of 
  lime-sulphur 
  and 
  arsenate 
  

  

  of 
  lead, 
  alone 
  and 
  combined. 
  

  

  [Experiment 
  started 
  Aug. 
  19, 
  1912, 
  Benton 
  Harbor, 
  Mich., 
  20 
  larvae 
  in 
  each 
  lot.] 
  

  

  

  

  Larvae 
  dying 
  in 
  each 
  lot. 
  

  

  Date 
  of 
  examina- 
  

   tion. 
  

  

  Lotl— 
  

  

  Check 
  

  

  (un- 
  

  

  sprayed). 
  

  

  Lot 
  2— 
  

   Lime- 
  

   sul- 
  

   phur, 
  

   ^50. 
  

  

  Lot 
  3— 
  

   Lime- 
  

   sul- 
  

   phur, 
  

   f-50. 
  

  

  Lot 
  4— 
  

   Lime- 
  

   sul- 
  

   phur. 
  

   li-50. 
  

  

  Lot 
  5— 
  

   Lime- 
  

   sul- 
  

   phur, 
  

   3-50. 
  

  

  Lot 
  6— 
  

   Arse- 
  

   nate 
  of 
  

   lead, 
  

   i-50. 
  

  

  Lot 
  7— 
  

   Arse- 
  

   nate, 
  of 
  

   lead, 
  

   1-50. 
  

  

  Lots— 
  

   Arse- 
  

   nate 
  of 
  

   lead, 
  

   2-50. 
  

  

  Lot 
  9— 
  

  

  Arse- 
  

   nate 
  of 
  

   Lead, 
  

   3-50. 
  

  

  Lot 
  10— 
  

   Arse- 
  

   nate 
  of 
  

   lead, 
  

   5-50. 
  

  

  Aug. 
  21 
  

  

  

  

  1 
  

  

  2 
  

   1 
  

  

  7 
  

   7 
  

   2 
  

  

  2 
  

  

  8 
  

   10 
  

  

  3 
  

   2 
  

   9 
  

   6 
  

  

  "~2 
  

  

  8 
  

   7 
  

   3 
  

  

  3 
  

   10 
  

  

  7 
  

  

  4 
  

   2 
  

  

  14 
  

  

  5 
  

   13 
  

  

  2 
  

  

  12 
  

  

  23 
  

  

  

  1 
  

   2 
  

   8 
  

   8 
  

   1 
  

  

  8 
  

  

  25 
  

  

  

  

  27 
  

  

  

  

  29 
  

  

  

  

  

  

  

  

  31 
  

  

  

  

  

  

  

  

  Sept. 
  2 
  

  

  

  ! 
  

  

  

  

  

  

  

  4 
  

  

  

  

  ! 
  

  

  

  

  

  

  

  6 
  

  

  

  

  

  1 
  

  

  

  

  

  

  

  8 
  

  

  

  

  

  i 
  

  

  

  

  

  

  

  10 
  

  

  

  

  

  I 
  

  

  

  

  

  

  

  15 
  

  

  3 
  

   5 
  

  

  

  

  

  

  

  

  

  

  

  Oct. 
  3 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  Total 
  num- 
  

   ber 
  dead... 
  

   Number 
  days 
  re- 
  

  

  8 
  

  

  20 
  

  

  12 
  

  

  3.51 
  

  

  20 
  

   12 
  

  

  2.87 
  

  

  20 
  

  

  8 
  

  

  0.17 
  

  

  20 
  

  

  8 
  

   0.49 
  

  

  20 
  

  

  10 
  

  

  2.44 
  

  

  20 
  

  

  6 
  

  

  0.36 
  

  

  20 
  

  

  6 
  

  

  0.57 
  

  

  20 
  

  

  

  

  0.24 
  

  

  20 
  

   4 
  

  

  Square 
  inches 
  of 
  

   foliage 
  consumed. 
  

  

  72.00 
  

  

  0.02 
  

  

  

  

  

  Larvae 
  dyin 
  

  

  % 
  in 
  each 
  lot. 
  

  

  

  

  Date 
  of 
  examination. 
  

  

  Lot 
  11— 
  

  

  Lime- 
  

   sulphur, 
  

  

  l|-50; 
  

  

  arsenate 
  

  

  of 
  lead, 
  

  

  i-50. 
  

  

  Lot 
  12— 
  

  

  Lime- 
  

   sulphur, 
  

  

  11-50; 
  

  

  arsenate 
  

  

  of 
  lead, 
  

  

  1-50. 
  

  

  Lot 
  13— 
  

  

  Lime- 
  

   sulphur, 
  

  

  l|-50; 
  

  

  arsenate 
  

  

  of 
  lead, 
  

  

  2-50. 
  

  

  Lot 
  14— 
  

  

  Lime- 
  

   sulphur, 
  

  

  l|-50; 
  

  

  arsenate 
  

  

  of 
  lead, 
  

  

  5-50. 
  

  

  Lot 
  15— 
  

   Arsenate 
  

   of 
  lead, 
  

  

  2-50; 
  

  

  lime- 
  

   sulphur, 
  

  

  i-50. 
  

  

  Lot 
  16— 
  

   Arsenate 
  

   of 
  lead, 
  

  

  2-50; 
  

  

  lime- 
  

   sulphur, 
  

  

  |-50. 
  

  

  Lot 
  17— 
  

   Arsenate 
  

   of 
  lead, 
  

  

  2-50; 
  

  

  lime- 
  

   sulphur, 
  

  

  l|-50. 
  

  

  Lot 
  18— 
  

   Arsenate 
  

   of 
  lead, 
  

  

  2-50; 
  

  

  lime- 
  

   sulphur, 
  

  

  3-50. 
  

  

  Aug. 
  21.. 
  . 
  

  

  

  

  3 
  

   9 
  

   7 
  

   1 
  

  

  10 
  

   10 
  

  

  9 
  

   9 
  

   2 
  

  

  5 
  

   11 
  

  

  4 
  

  

  1 
  

   6 
  

   13 
  

  

  6 
  

  

  23 
  

  

  2 
  

   8 
  

   6 
  

   4 
  

  

  14 
  

  

  4 
  

   2 
  

  

  9 
  

  

  25... 
  

  

  5 
  

  

  27... 
  

  

  

  

  29... 
  

  

  

  

  

  

  

  31 
  

  

  

  

  

  

  

  

  

  Sept. 
  2 
  1 
  

  

  

  

  

  

  

  

  

  4 
  

  

  

  

  

  

  

  

  6 
  1 
  

  

  1 
  

  

  

  

  

  

  

  8 
  

  

  

  

  

  

  

  

  10 
  1 
  

  

  :::::::::;;:::::::: 
  

  

  

  

  

  

  

  15 
  

  

  i 
  

  

  

  

  

  

  

  Oct. 
  3 
  

  

  i 
  

  

  

  

  

  

  

  

  

  i 
  

  

  

  

  

  

  

  Total 
  number 
  

  

  20 
  

  

  10 
  

  

  0.52 
  

  

  20 
  

  

  8 
  

  

  0.02 
  

  

  20 
  

  

  8 
  

  

  0.28 
  

  

  20 
  

  

  4 
  

  

  0.07 
  

  

  20 
  

  

  6 
  

  

  0.30 
  

  

  20 
  

  

  6 
  

  

  0.19 
  

  

  20 
  

  

  6 
  

  

  0.06 
  

  

  20 
  

  

  Number 
  days 
  re- 
  

   quired 
  to 
  kill 
  

  

  Square 
  inches 
  of 
  foli- 
  

   age 
  consumed 
  

  

  6 
  

   0.22 
  

  

  None 
  of 
  the 
  larvae 
  on 
  the 
  unsprayed 
  lot 
  died 
  until 
  September 
  15, 
  

   27 
  days 
  after 
  the 
  experiment 
  was 
  started. 
  On 
  October 
  3 
  the 
  records 
  

   of 
  this 
  lot 
  showed 
  8 
  dead, 
  6 
  pupated, 
  and 
  6 
  missing. 
  Lime-sulphur 
  

   alone, 
  i-50, 
  and 
  likewise 
  f-50, 
  killed 
  all 
  the 
  larvse 
  in 
  12 
  days, 
  while 
  

   the 
  time 
  required 
  by 
  strengths 
  of 
  1J-50 
  and 
  3-50 
  was 
  8 
  days 
  in 
  each 
  

   case, 
  the 
  rapidity 
  of 
  killing 
  being 
  somewhat 
  greater 
  with 
  the 
  latter 
  

   strength. 
  Arsenate 
  of 
  lead 
  alone, 
  ^-50, 
  killed 
  the 
  20 
  larvse 
  in 
  10 
  days, 
  

   or 
  2 
  days 
  more 
  than 
  was 
  required 
  by 
  lime-sulphur, 
  H-50. 
  Arsenate 
  

  

  